Frieurick schneider



- (No Model.) I

F. SCHNEIDER. ROTARY VALVE.

No. 449,181. Patented Mar. 31, 1891 Imentor:

cumlm kexmaem UNITED STATES- PATENT ()FFIcE.

FRIEDRIOK SCHNEIDER, OF N EW YORK, N. Y.

ROTARY VALVE.

SPECIFICATION forming part of Letters Patent No. 449,181, dated March 31, 1 891. Application filed July 5, 1890. $erial No. 357,720. (No model.)

To all whom it may concern:

Be it known that I, FRIEDRICK SCHNEIDER, of the city, county, and State of New York, have invented a new and useful Improvement in Rotary Valves for Anhydrous and other .High-Pressure Gases Especially for Use in Ice-\Iachinesgand I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

My invention relates to rotary reducingvalves for the control of gases under pressure, and more particularly to the valves in refrigerating and ice machines.

In the use of the customary valves for reducing pressure in the delivery of anhydrous ammonia and other similar gases difficulty and annoyance are occasioned from the clogging of the valve by reason of the presence of solid particles in the gas, which depositthemselves in the valve-opening.

The object of my invention is to provide a simple and efficient reducing-valve for the delivery of gases under pressure, which will admit of being automatically cleared by a simple reversal thereof without removal from its seat; and it consists in a novel construction and arrangement of the perforated plates or disks in the valve, in combination with a clearing-pin, substantially as is hereinafter described and claimed.

In the accompanying drawings, Figure l is a central diametric section of my improved rotary reducing-valve for the gas-pipes in icemachines, showing the same open for the delivery of a supply of gas. Fig. 2 is a similar view of the same valve, illustrating it when reversed to obtain its automatic clearance; and Fig.3 illustrates a modification in the construction of the valve.

Similar letters indicate like parts in all of the figures.

A represents the body of the valve of customary form, and B the supply or high-pressure pipe, and C the delivery or low-pressure pipe connected thereto.

D is the plug of the valve transversely perforated to form a cylindrical valye-opening for the passage of the gas throughit, and this transverse cylindrical opening formed with two shoulders or offsets c andftherein, which successively reduce its diameter.

A plate or disk G is fitted within the central portion of the cylindrical valve-opening to play freely yet closely therein against the shoulder f. This inner movable disk G is of such width as to have full bearing within the valve opening, and its play is confined to the space between the shoulders c and f by means of an outer plate or disk H, fitted to enter and close the larger end of the valveopening and to seat itself against the shoulder 6, as shown in the drawings, said outer disk being secured and made fast by means of screws 1' t or in other suitable manner. This outer fixed disk or diaphragm His perforated with one or more openings m m for the free admission of gas under pressure into and through the valve, the pressure of the gas being, however, controlled and reduced in its delivery by means of a single central opening a, provided for its eduction in the movable disk G. This eduction-port a is preferably outwardly enlarged, as shown in the drawings, to facilitate its clearance. A clearing-pin R is fitted to project inwardly axially from the center of the outer fixed disk or diaphragm II, and is made of a diameter to pass readily through the central eduction-port in the movable disk G, with which it is made to register exactly, so that when the disk G is moved inwardly toward the disk H the pin will enter said port, as shown in Fig. 2 of the drawings.

I11 the normal operation of the valve the gas admitted under high pressure from the pipe 13 will enter freely through the aper tures m m in the outer disk I I into the central space within the valve, and its delivery thence will be controlled and determined by the size of the single small aperture or eduction port n in the movable disk G, which under the pressure will be kept closely seated against the offset f and away from the clearing pin R. The gas will thus be delivered as is customary with greatly diminished press ure into the pipe 0. If, however, the educ tion-port n in the disk G becomes clogged and choked, so as to impede the delivery of the gas, it is only necessary to give the valveplug a full halfQturn, and thereby bring the disk G toward the high-pressure pipe B. "The effect of this will be to drive the disk G inward toward the disk H, and this movement will cause the clearing-pin R to enter and project through the eduction-port n, and thereby effectually clean and clear it from any obstruct-ion, while at the same time it will close it, and thereby close the "alve against a flow of gas through it so long as it remains in this position. Upon reversing the valve it will resume its customary functions with its eduction-port 01 fully cleared.

To avoid a too sharp and sudden movement of the disk G toward and against the offset f when the valve is reversed by suddenly bringing the high pressure of gas in the pipe B to bear upon it while it is still against thedisk H, I prefer to insert a spring S between the disks G and H, so that it shall be compressed when the disk G is carried tozo ward the disk 11 and operate automatically to carry it back against the shoulder f before, in the reversal of the valve, the high pressure is admitted through the disk 1-1.

As a modification in the constructionof the valve, the outer disk H may be divided circumferentially into two sections, one of which is recessed to form an intermediate chamber t, as shown in Fig. 3. The perforationsin the inner division U are in such case reduced in 3 number or made smaller than those in the outer section, so that the pressure of gas will be measurably reduced in passing through the two sections into the central space in the valve. Both sections are fixed so as to form in effect a single piece with a central chamber t therein, and the clearing-pin R for the movable disk G .is made to project from the inner section U in like manner as from the disk H, previously described, and to operate in the same manner.

It is evident that the pin may be made to project from the movable disk into an opening pierced in the stationary disk, instead of vice versa, as above described.

I claim as my invention- 1. The combination, in a rotary valve, with its rotatable plug and the transverse opening therein, of a movable perforated disk mounted to play axially in said opening, and a clearing-pin fixed to project opposite thereto to 5c register with the perforation in the disk and enter and project through the same when by a reversal of the valve-plug the disk is driven toward it and to be withdrawn therefrom when the disk is carried in the opposite direction in the regular action of the valve, substantially in the manner and for the purpose herein set forth.

2. The combination, with the plug in a rotary valve, of a movable disk playing axially in the transverse opening through the plug,

a stationary diskclosing one end of said opening, one or more supply-apertures in one of said disks, a delivery-aperture of red uced area in the opposite disk, anda pin projecting from the first disk in position to enter and project through the reduced aperture in the second disk when by a reversal of the valve the one disk is driven toward the other and to be withdrawn therefrom in the ordinary action of the valve, substantially in the manner and for the purpose herein set forth.

3. The combination, with the rotatable plug in a rotary valve and the opening through said plug, of a transverse disk or diaphragm fixed at one end of said opening and having one or more apertures through it, a pin projecting centrally inwardly from said diaphragm, a movable disk fitted to play in said opening in front of said diaphragm and hav- 8o ing a central perforation therein of less area than the area of the apertures through the fixed diaphragm'in position to be entered and closed by the pin when the disk is carried toward the diaphragm, and a spring interposed between the movable disk and diaphragm to hold them normally apart, substantially in the manner and for the purpose herein set forth.

In testimony whereof I have signed my name to this specification in the presence of 0 two subscribing witnesses.

FRIEDRIOK SCHNEIDER.

Witnesses:

LoUIs MAND, A. N. J ESBERA. 

